bipolar transistor in which current flows across the base in the direction parallel to the wafer surface; in contrast to conventional vertical bipolar transistor in which current across the base flows in the direction normal to the surface; l.t. features inferior characteristics as compared to vertical transistor.

vertical transistor

bipolar transistor in which current across emitter-base and collector-base junctions flows in the direction normal to the wafer surface; conventional configuration as opposed to lateral transistor which features inferior characteristics.